1. you want to make the spider worth doing by changing the rewards? because imo eidolons are much MUCH more useful and a lot easier (less gear requirement/less cc/no mobs etc.)
2. make scaling rewards for at least kuva survival, like 5% increased kuva for every kuva capsule drained to make them worthy for endurance runs. rivens are pure rng and around 50% of all weapon stats are useless